Research On Location Of D2D User Algorithm Of Interference Coordination

The growing business needs of the local data sharing put forward higher requirements to IMT-Advanced system coverage and service flexibility, when the base station as the center, the service delivery model to adapt to development of local business showed obvious limitations. D2D (Device-to-Device) communication is the local user communication does not require data forwarding through the base station, but in such a close range, the data transmission through direct link of device-to-device, it improves the user experience and data transmission rate.This paper briefly introduces the basic concept of D2D and the process of session establishment in hybrid network, after analysis of interference under different D2D resource sharing mode and introduction of existing two interference coordination methods, power control and wireless channel allocation, we put forward optimized dynamic power control scheme and semi-dynamic wireless channel allocation scheme, and then propose the algorithm of interference coordination based on the D2D user’s location.Firstly, the optimization of the dynamic power control scheme proposed by Klaus Doppler. Dynamic power control scheme proposed by Klaus Doppler considers the base station and the cellular user as interference object of D2D user simultaneously. Actual case, the base station receives the uplink signal, the cellular user receives the downlink signal, the signal of D2D user will only interfere with one of the base station and the cellular user. Therefore, in the optimized scheme, the uplink and downlink are separately considered, and so guarantee that the hybrid network without a new interference, while reducing the power limitation of D2D. Simulation results show the proposed scheme improves the cellular user SINR and the throughput, the effectiveness of the scheme has been verified.Secondly, we propose the algorithm of interference coordination based on the D2D user’s location. The proposed algorithm takes the D2D user’s adjacent location as the background, considers that cellular user group may has low loading rate and puts forward coordinating the interference between user groups combining wireless channel allocation and optimized power control scheme. First, according to the cell-edge D2D users’geographic location, D2D users are divided into a D2D User Group seen as an object. Then, we allocate the different resources to the D2D User Group. Finally, the application of optimized power control scheme will be used to make the interference coordination according to the allocated resource. The simulation results illustrate the algorithm can improve cell-edge users’SINR and reduce blocking rate of cell-edge users, prove the effectiveness of the algorithm.